Cryptography and Network Security

  1. Classical Encryption Techniques
    1. Symmetric Cipher Model
      1. Components of a Cryptosystem
        1. Plaintext
          1. Message Format
            1. Character Sets
            2. Ciphertext
              1. Encrypted Output
                1. Ciphertext Properties
                2. Key
                  1. Key Space
                    1. Key Length
                      1. Key Distribution
                      2. Encryption Algorithm
                        1. Algorithm Design
                          1. Computational Complexity
                          2. Decryption Algorithm
                            1. Inverse Operations
                              1. Key Recovery
                            2. Cryptography vs. Cryptanalysis
                              1. Goals of Cryptography
                                1. Confidentiality
                                  1. Authentication
                                    1. Integrity
                                    2. Goals of Cryptanalysis
                                      1. Key Recovery
                                        1. Message Recovery
                                          1. Algorithm Breaking
                                          2. Types of Cryptanalytic Attacks
                                            1. Ciphertext-Only Attack
                                              1. Known-Plaintext Attack
                                                1. Chosen-Plaintext Attack
                                                  1. Chosen-Ciphertext Attack
                                                    1. Adaptive Attacks
                                                2. Substitution Ciphers
                                                  1. Caesar Cipher
                                                    1. Algorithm and Example
                                                      1. Key Space Analysis
                                                        1. Strengths and Weaknesses
                                                          1. Brute Force Attack
                                                          2. Monoalphabetic Ciphers
                                                            1. Algorithm and Example
                                                              1. Key Space Calculation
                                                                1. Frequency Analysis Attack
                                                                  1. Letter Frequency
                                                                    1. Digram Analysis
                                                                      1. Trigram Analysis
                                                                      2. Statistical Cryptanalysis
                                                                      3. Playfair Cipher
                                                                        1. Algorithm and Key Table
                                                                          1. Key Square Construction
                                                                            1. Encryption Rules
                                                                              1. Decryption Process
                                                                              2. Security Considerations
                                                                                1. Frequency Analysis Resistance
                                                                                  1. Known Weaknesses
                                                                                2. Hill Cipher
                                                                                  1. Matrix-based Encryption
                                                                                    1. Matrix Operations
                                                                                      1. Modular Arithmetic
                                                                                      2. Key Requirements
                                                                                        1. Invertible Matrices
                                                                                          1. Determinant Conditions
                                                                                          2. Vulnerabilities
                                                                                            1. Known-Plaintext Attacks
                                                                                              1. Linear Algebra Attacks
                                                                                            2. Polyalphabetic Ciphers
                                                                                              1. Vigenère Cipher
                                                                                                1. Algorithm and Key Repetition
                                                                                                  1. Tabula Recta
                                                                                                    1. Encryption Process
                                                                                                      1. Decryption Process
                                                                                                        1. Kasiski Examination
                                                                                                          1. Repeated Patterns
                                                                                                            1. Key Length Determination
                                                                                                            2. Index of Coincidence
                                                                                                              1. Security Analysis
                                                                                                                1. Frequency Analysis Resistance
                                                                                                                  1. Key Length Attacks
                                                                                                            3. Transposition Ciphers
                                                                                                              1. Rail Fence Cipher
                                                                                                                1. Algorithm and Example
                                                                                                                  1. Zigzag Pattern
                                                                                                                    1. Security Analysis
                                                                                                                      1. Cryptanalysis Methods
                                                                                                                      2. Row-Transposition Ciphers
                                                                                                                        1. Simple Columnar Transposition
                                                                                                                          1. Keyed Transposition
                                                                                                                            1. Key-based Column Ordering
                                                                                                                              1. Multiple Rounds
                                                                                                                              2. Security Considerations
                                                                                                                                1. Anagram Analysis
                                                                                                                                  1. Pattern Recognition
                                                                                                                              3. Steganography
                                                                                                                                1. Principles of Steganography
                                                                                                                                  1. Hiding Information
                                                                                                                                    1. Carrier Media
                                                                                                                                      1. Imperceptibility
                                                                                                                                      2. Methods of Steganography
                                                                                                                                        1. Text Steganography
                                                                                                                                          1. Character Spacing
                                                                                                                                            1. Font Variations
                                                                                                                                              1. Linguistic Steganography
                                                                                                                                              2. Image Steganography
                                                                                                                                                1. Least Significant Bit (LSB)
                                                                                                                                                  1. Palette-based Methods
                                                                                                                                                    1. Transform Domain Methods
                                                                                                                                                    2. Audio Steganography
                                                                                                                                                      1. Echo Hiding
                                                                                                                                                        1. Phase Coding
                                                                                                                                                          1. Spread Spectrum
                                                                                                                                                          2. Video Steganography
                                                                                                                                                            1. Frame-based Hiding
                                                                                                                                                              1. Motion Vector Manipulation
                                                                                                                                                            2. Detection and Countermeasures
                                                                                                                                                              1. Steganalysis Techniques
                                                                                                                                                                1. Statistical Analysis
                                                                                                                                                                  1. Visual Inspection

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                                                                                                                                                              1. Introduction to Security

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                                                                                                                                                              3. Modern Symmetric Ciphers